Molding apparatus.



2 SHEETS-SHEET 1.

PATENTED MAR. 3, 1908.

l M. BERNHART. MOLDING APPARATUS.

APPLICATION FILED MAY 14, 1907.

No. 880,500. PATENTED MAR. 3,-1-908. x

M. BERNHART.

MOLDING APPARATUS.

APPLICATION FILED YMAY 14, 1907.

2 SEEETS--SHHET-2.l

UNITED sTATEs PATENT oEEroE.

MICHAEL BERNHART, OF LANCASTER, NEW YORK, ASSIGNOR OF ONE-HALF TO JAMES D. BRENNAN, OF LANCASTER, NEW YORK.

MOLDIN G APPARATUS.

Specification of Letters Patent.

Patented March 3, 1908.

Application filed May 14, 1907. Serial No. 373.700.

T o all whom 'it may concern.'

Be it known that I, MICHAEL BERNHART, a citizen of the United States, residing' at Lancaster, in the county of Erie and State of New York, have invented a new and useful Improvement inMolding Apparatus, of which the following is a specification.

This invention relates to the art of casting, and particularly to apparatus for molding molds for the oil-boxes used upon caraXles and for molding similar articles.

An important object of my invention is the provision of means to maintain a pattern in such stable relation to the ordinary reversible flask, drag or similar device in wellknown use upon the common casting floor as a container for the sand rammed about the pattern, that after the sand has been rammed, the drag may be rolled over or reversed quickly in the ordinary manner, without special apparatus, the pattern may be smartly rapped7 without special precautions, to loosen it in the cavity, and the pattern may then be withdrawn freely and quickly without lateral or other displacement, which enlarges the cavity.

Another object of my invention is to pro- 'vide such means that these operations may be performed successfully by the ordinary unskilled foundry workman, instead of by the most expensive workman,-the molder, who is required by present practice to do the rapping and drawing.

The term stripping plate is used hereinafter not in any technical sense, but as a brief designation for a device having an edge, wall or portion corresponding in contour exactly or approximately with the periphery of the pattern at the region of its withdrawal from the mold cavity.

The stripping plate will preferably be connected to the drag with the stripping'wall extending across the sand adjacent to the rim of the mold cavity, so that as the pattern is withdrawn the stripping edge guides the pattern and prevents any destructive lateral, rotative or nutative engagement by it with the sand forming the walls or rim of the mold cavity. At the same time, the stripping plate restrains the sand around the rim, and its edge also strips from the surface of the pattern any adhering particles of sand the withdrawal of which would mar the mold.

In the accompanying drawings consisting of two sheets: Figure 1 is a vertical longitudinal section of a molding flask or drag embodying the invention, showing the position of the wparts after ramming the drag and preparatory to reversing it` to withdraw the pattern. Fig. 2 is a top plan view of the drag showing the retractible pattern-supports or holders turned aside to release the pattern. Fig. 3 is a transverse section in line 33, Fig. 2. Fig. 4 is a top plan view of the stripping plate, showing a modified construction of the pattern-supports.

Similar letters of reference indicate corresponding parts throughout the several views.

Referring to Figs. 1,-2 and 3, A indicates the drag of the flask which may be of any suitable or well-known construction, and B its removable bottom board secured in place by the customary clamps C and wedges C1.

ably secured thereto by the clamps C or any other suitable means. This plate may have holes to receive the usual dowels f ofthe i drag for reliably holding the plate against lateral and endwise displacement. This stripping plate has in the instance illustrated, a stripping opening which receives the upper end of the pattern and which conforms toand closely fits the same.

Suitable means are provided for retaining or supporting the pattern in its proper position in the stripping-plate during the ramming of the inverted drag. In the construction shown in Figs. 1, 2 and 3, these supporting devices consist of turn buttons g pivoted to the upper side of the stripping plate, preferably at the four main corners ing, and adapted to project inwardly beyond the edge of said opening to support the inverted pattern, as shown in Fig. l, or to be turned aside to release the lpattern after ramming and reversing the drag, as shown in Fig. 2. Stop-pins g1 are preferably arranged on the stripping plate to limit the locking movement o f the turn-buttons. The plate may be constructed of aluminium or other suitable material and is preferably provided on its upper side along its longitudinal edges with cleats 7L with which the clamps C engage.

In the use of the invention, the stripping plate is placed face downward on a suitable support, its buttons g are turned to extend into its opening and the pattern is then of its openplaced into the opening of the plate so that its upper end rests upon the turn buttons, as seen in Fig. 1. The inverted drag is next placed upon the stripping plate, sand is rammed in it and the bottom board B secured in place by the clamps C. The drag is then reversed to its normal position, as shown in Figs. 2 and 3, the buttons are turned aside,

`and the pattern is rapped to loosenit in the cavity, and is withdrawn through the stripping plate. Then the latter is removed from the drag, the cores', if any, are put in place and the cope, (not shown in Figs. 1, 2`

l improvement, no skill is required and no special care need be exercised in withdrawing the pattern, and unskilled labor may therefore be employed, thus not only effecting an important saving of time in the production of the molds, but greatly reducing their cost, while at the same time providing for the prog duction of accurate, high-grade castings.

Other retractible supporting devices may be substituted for the turn buttons g, if desired. For example, as shown in Fig. 4, sliding bolts g2 moving in suitable guides g3 may be employed, for this purpose.

My invention is of special utility in the formation of molds from patterns having deep, straight sides, as in'the instance of the oil boxes to which reference has been made above, but it will be understood that I do not limit my invention to use in the formation of such boxes, nor to embodiment in the specific forms of construction herein illustrated; nor dol I limit myself to any specific form of retaining means except as set forth in the claims.

I claim as my invention:

l. A stri ping plate for a molding flask; said plate liaving an opening to receive a pattern; and means movable on said plate for holding said pattern in said o ening while ramming said flask; substantially as setforth'.

2. The combination of a drag or flask, a pattern, a stri ping plate adapted to rest on the drag and aving an opening which receives the pattern, and turn buttons pivoted to the stripping plate and arranged to project into the opening thereof for supporting the pattern in the ramming position of the drag, substantially as set forth'.

3. A stripping plate for a molding flask having an opening adapted to receive a pattern and retractible supports arranged to project into its opening for sustaining the pattern therein, substantially as set forth.

4. A stripping plate for a molding flask having an opening adapted to receive a pattern, and turn buttons pivoted to the plate adjacent to the edge of its opening and adapted to support the pattern therein, substantially as set forth.

5. The combination with a stripping plate for a'molding flask.; said plate having a stripping opening to pass a pattern; of means to engage said pattern and hold it in said opening; said means being removable from said engagement Ato permit free passage of said pattern; substantially as described.

6. The combination with a pattern member and a stripping member for a molding flask; said stripping member having a stripping opening normally open to pass a pattern freely; of means carried by one of said members to engage said other member at.

times to prevent passage of said pattern through said opening; substantially in the manner and for the purpose set forth.

7. The combination with a pattern and a stripping plate for a molding flask; said plate having a stripping opening normally open to pass said pattern freely; of means to connect said pattern and stripping plate at times to retain said pattern in adjusted osition in said opening; substantially in the manner and for the purpose set forth.

Witness my hand this 11th day of May, 1907.

MICHAEL BERNHAR-T.

Witnesses:

J. D. BRENNAN, (1F. GEYER. 

